Testing device



T.D.LYNCH.

TESTING DEVICE.

APPLI(?ATION FILED DEC.26| 1913.

Patented May 2, 1922 Number 02 Hammer Jfro /ra.r.

y SINVENTOR BY V ATTORNEY UNiiTjED res PATENT orifice.

'IILLMAN n. LYNomorPITTsBUeeH, PENNsYnvANIA, AssIGNoRTQWESTINGI-QIOUSY'E' ELECTRIC ANnMANUrAorURINe COMPANY, A ooRroRATIo oFPENNSYLVANIA."

TESTING DEVICE. 1 i

T all ii /i071; it may concern: I

Bedt known that I, TIL-LMAN D. LrNoi-r, a citizen of the United States,and a resident of Pittsburgh,- in the county of Allegheny and Staten-fPennsylvania, have inventeda new and useful Improvement in TestingDevices, of which the following is a specifiCation. 1 Y

. .My invention relatesto testing devicesand I particularly to devicesfortestin 'the rela tive brittleness and toughness of metals. Myinvention has for, its principal object to provide hammer devices fortesting the relative toughness and brittlenessof alloys which areusdiiforbearingsand other similar purposes. I I p I V ..,I%1eretoforethetoughness of a metalhas been tested by placing a ball about 1 0millimeters in diameter; on the specimenito be testedand then placing aheavyweight/on of -time. The impression of the ball was consideredameasure of the-relative hardness of the metal being tested, but-1t didnotcon stitutea measure of the degreeof brittleness of theumetal aknowledgeof which was-ess entialv if; thehmetal was to used forbearings, and especially if the temperature,

at'whic'hthe metal was poured orto which it was heatedaifectedzitsbrittleness, There-- fore, in order to test a sample ofmetal for] its relative.brittleness, I' PlOVlClG theham-J mer devicehereinafter described andclainied.

In the accompanying drawing, Fig 1 is a side "elevationa'l view of ahammer device embodying my invention, Fig. 2 is a plan View of thedevice shown in Fig. 1 and Fig.

3 is a record of tests performed with a device embodying my invention.

Referring to the drawings, my invention embodies an automaticallyoperating hammer device 1 comprising a base structure 2 upon which ismounted a plurality of standards 3 for guiding a hammer 4t that is at-,

tached to a flat bar 5 having-a notch 6 in one side thereof. A motor 7is mounted on the base 2 and drives a grooved pulley 9 on a shaft 10 bymeans of a grooved pulley8 and a suitable belt 8 A second pulley 11 onthe shaft 10 is operatively connected to a pulley 12 on a shaft 13 by abelt 11. The shaft 13 has mounted thereon a Wheel 14 having a covering15 of leather over a portion of its circumference. The leather cov-Specification of Letters Patent.

ering'15 is arranged to have a projectionlti atone of its ends forengaging the notch 6 in. the barb to insure positive operation.

The wheel lt has flanges 17 for guiding the I Patented May 2, 1922.

Application filed December 26,19 13. Serial o. 808,712.

17 for reasons hereinafter explained. The

bar' is maintained in contact with the leather ,covermg .15 of the wheel14; by a friction idler wheel 18 h i movable,

ings19fwhich are acted upon by springs 20.

An anvil 2l is disposed between the stand ardsfi directly beneath thehammer 1.. I

order toi register the number of strokes thellrammer makes, I provideacra'nk, 22 on the 'end'ofthefshaft 13 which-transmits its motionthrough:a connectingrod. 23 ,to a.

lever arm 24'that is, operatively connected mf-any ll k n to a. countingdevicedesign.

lejness ihto ,aiinould of a definite size.

of thel'baif, friction fbetweenthe wheel 18 and: the. leather" covering15 being sufficient" to continue thef' upward movement.-

when the'point, 27 of the leather covering 15' reaches the positionshowninFig. :1," the cams 17 engage the'rims of friction wheel A E amplle' 26of the metal to [be tested-for .s' P e by: rout e "t m t 1 I a lY e othe/sample 26 is placedf-upon-the anvil 18 and compressthe springs 20,thus releas ing the bar 5 and allowing the hammer 4 to drop freely uponthe test sample 26. As the Wheel 14 continues to rotate, the notch 6 isagain engaged'by the projection 16 and the operation hereinbeforedescribed is repeated. As a considerable number of hammer strokes isnecessary to test some pieces, the mechanism 1s preferably designed toensure a rapid recurrence of such strokes. The thlckness of the sample26 is-measured before testing,

and, after a definite numberofstrokes, depending upon the'metal beingtested, the thickness of the sample is again measured and the operationis continued. A curve is" plotted with the thicknesses ofthe samplejasordinates and the number of strokes has f v L in Fig. 3.

actuall' went to ieces thus ivin" a relafive measure of its brittlenessand toughness as compared with the metal represented by curve A; Thecurves, B, C, D, 'E, and F represent the relative brittleness andtoughness of a lead base alloy for bearings which has been heated todifferent temperatures and poured under different conditions. Therelative conditions of the samples, in respect f to disintegration aftera definite number of strokes, 18 an indication of thelr relativebrittleness. 1

While I havedescribedthe preferred form cf-my invention, changes may bemade inits form ofconstruction which. do not. depart from the spiritlandscope'of the same as set forth in the appendedclaims. V 5" f1 claim asmy" invention:

i '1. A testing device including an anvil, an

impact member movable ,into and outof enjement withthe anvil, a baroperatively connected to theimpactl member, friction rollersengagingagainst "opposite sides of the .barrmeansfor rotating one of the roll-ffers, resilient means holding the other roller in yielding-.engagement*with the bar and means for intermittently moving suchirollpr out ofengagement with the bar.

A sample "testing "device including an] 7 I disposed relative to theimpact member.. 7

' In testimony whereof, I have hereunto anvil, an imp act member'co-operating, there'- 7 withg abar op'eratively connected to suchmember, a driven friction roller engaging one side of the bar andprovided with peripheral flanges engaging the side edges of the bar toguide it, a second friction roller yieldably held in engagement with theopposite side of the bar, andmeans governed by the turning of the firstfriction roller for roller out of engagement with the bar;

3. Asample testing device including-an anvil, a co-operating impactmember, a bar having connection with such member, a

driven friction roller having spaced peripheral flangesengaging theedges of the bar, a second friction roller yieldably held in engagementwith the bar at a point opposite the point of engagement of the bar withthe first roller, and cam means carried by the first roller forintermittently moving the second roller out of engagement with the bar.a

4. A sample testing device including a pair of friction rollers, one ofthe friction rollers having spaced peripheral flanges engaging theperiphery of the other roller and 7 provided with cam portions, theother roller being yieldably held in engagement with the first, a rodmounted between the rollers and between the flanges of the first rollerto be raised through turning of the rollers and released throughengagement of the cam portions ofthe'flanges of the first roller with jthe periphery of the second roller, an impact membercarried by the barand-an anvil disposed in the path of movement of the impact member. g 5.A: sample testing'device including opposed friction rollers, a bardisposed between the rollers, means yieldably holding the rollers'inengagement with opposite sides of'the bar, means forintermittentlymoving the, A

rollers 'away 'fr om each other, pawl; and

notch co-operating means between one'of the rollers and the barfor positvely'engaging the bar after it has been released 0 separation of therollers,- an impact member carried by the bar and an anvil operativelyO. W. A. OE'r'rING, B. B. HINES.

